There are only 3 pages on Smith in the archive. They cover his 5-year period of service with the Territorials, from 26 May 1909 to 25 May 1914, when he left the London Regiment (The Rangers) as Lance Corporal.
The records state that

Smith was 29 and 5 months when he joined

He was married and living at 13 Effort Road, Highbury

He was a clerk with “Ellis & Co”

He was 5 feet 10 inches tall, with a chest of 34½ inches, which he could expand by 2 inches